Current/Recent events related to acidification of a lake?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

What is the correct term for living the most sustainable life you can within your current circumstances?

When water dissociates, each water molecule splits into a hydroxide ion and a) h 3 o + b) a hydrogen atom c) a hydrogen ion d) h 2 o e) oh —